<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        a {
            text-decoration: none;

        }

        .glow-btn {
            display: block;
            width: 120px;
            height: 40px;
            line-height: 40px;
            /* border: 1px solid red; */
            text-align: center;
            background-color: rgb(5, 66, 90);
            border-radius: 5px;
            color: #fff;
        }

        .glow-btn:hover {
            background-image: radial-gradient(circle at top center,
                    rgba(255, 255, 255, 0.4),
                    transparent);
        }
    </style>
</head>

<body>
    <a href="" class="glow-btn">发光按钮</a>
</body>

</html>